A method for preparing marine anticorrosive powder coating

Abstract

The invention belongs to the technical field of coatings, and in particular relates to a method for preparing a marine anticorrosive powder coating, comprising the following steps: S1, raw material preparation; S2, premixing, mixing epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole and ethylenebisstearamide, and obtaining component A after preheating, cooling and grinding; mixing shell powder, silicon oxide, quartz powder and kaolin, and obtaining component B after calcination, cooling and grinding; mixing glass flakes, graphene, red iron oxide and antioxidant DNP to obtain component C; S3, preliminary treatment, mixing, stirring and dispersing components A, B and C, and melt-extruding them through an extruder to obtain a blank, and tableting, cooling, cutting and grinding the blank to obtain a semi-finished product; S4, screening treatment, screening out ultrafine powder and coarse powder in the semi-finished product to obtain a finished product; compared with the prior art, the invention enables the raw materials to be more fully and evenly mixed in the premixing stage, and the preparation is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and more particularly to a method for preparing a marine anticorrosive powder coating. Background Art

[0002] The core function of marine anti-corrosion powder coatings is to resist corrosion for a long time and maintain the integrity of the coating. In view of the high salinity, high humidity, strong ultraviolet radiation and tidal effects unique to the marine environment, this type of coating must have excellent weather resistance, salt spray resistance, water resistance and good mechanical properties. These performance requirements ensure that the coating can maintain stability and durability in the marine environment for a long time, thereby effectively protecting the substrate from corrosion and damage.

[0003] The preparation of marine anti-corrosion powder coatings involves multiple steps that ensure the quality and performance of the coating so that it can protect metal structures from corrosion in the marine environment for a long time. The following are the main steps in the preparation of marine anti-corrosion powder coatings:

[0004] Raw material preparation: Prepare the raw materials for coatings, including special resins, pigments, fillers, curing agents and other additives. The quality and proportion of these raw materials have an important impact on the quality and coating performance of powder coatings.

[0005] Premixing: In the premixing stage, the resin powder, pigment and filler, curing agent, leveling agent and various additives are mixed evenly according to the formula. The purpose of premixing is to create a good physical condition for melt mixing so that the materials can be dispersed more evenly to ensure the dispersion of the materials and the stability of the coating color.

[0006] Melt extrusion: Melt extrusion is a key step in the manufacture of powder coatings. In this step, the various components of the powder coating are evenly dispersed in the molten resin state through mixing. This overcomes the problem of component separation caused by different material specific gravities during dry mixing. The melt extrusion equipment is usually an extruder, which can be a single-screw extruder or a twin-screw extruder.

[0007] Subsequent processing: After melt extrusion, the coating needs to be cooled, crushed, screened and other subsequent processing to obtain powder coating products that meet the requirements.

[0008] Although the above-mentioned powder preparation method can realize the preparation of general coatings, in the pre-mixing stage, the raw materials are mostly mixed and stirred by a mixer. During this process, the raw materials cannot be fully and evenly stirred, which affects the final coating effect of the coating; in the subsequent processing stage, the crushing of the raw materials for tableting after melting is relatively cumbersome and time-consuming. Summary of the invention

[0009] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for preparing a marine anti-corrosion powder coating that solves the above technical problems.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A method for preparing a marine anticorrosive powder coating comprises the following steps:

[0012] Raw material preparation, including epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole, graphene, ethylenebisstearamide, antioxidant DNP, glass flakes, shell powder, silicon oxide, quartz powder, red iron oxide, and kaolin;

[0013] Premixing: epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole and ethylenebisstearamide are mixed, and then preheated at 90-120°C for 15-25 minutes, and the material is cooled and fully ground to obtain component A; shell powder, silicon oxide, quartz powder and kaolin are mixed, and calcined at 240-300°C for 5-6 hours, and the material is cooled and fully ground to obtain component B; glass flakes, graphene, red iron oxide and antioxidant DNP are mixed to obtain component C;

[0014] Preliminary treatment: Component A, component B and component C are mixed, stirred and dispersed, and then melted and extruded through an extruder to obtain a blank; then, the blank is sheeted, cooled, cut and ground to obtain a semi-finished product;

[0015] Screening treatment is used to remove the ultrafine powder and coarse powder in the semi-finished product to obtain the finished product.

[0016] Furthermore, the raw materials are divided by weight as follows: 50-70 parts of epoxy resin, 1-20 parts of phenolic epoxy resin, 5-12 parts of trimethylhexamethylenediamine, 0.2-0.4 parts of dimethylimidazole, 3-5 parts of graphene, 0.8-1.2 parts of ethylene bisstearamide, 1-3 parts of antioxidant DNP, 0.5-1 parts of glass flakes, 5-10 parts of shell powder, 3-5 parts of silicon oxide, 3-5 parts of quartz powder, 0.2-0.5 parts of red iron oxide, and 5-8 parts of kaolin.

[0017] Furthermore, the glass flakes are flaky glass flakes of 2500-3000 mesh.

[0018] Furthermore, after the billet is extruded by the extruder, the billet is first squeezed into sheets by an extrusion roller, and then the sheeted billet is divided into several sections. Thereafter, the several sections of the billet are cooled and indentations are cut on the billet at the same time, and then the cooled billet is cut into several small pieces, and finally the several small pieces of billet are ground into powdery semi-finished products by grinding equipment.

[0019] Furthermore, the indentation is formed by a pressing die having a plurality of crisscrossing indentation plates, and the small piece of blank is formed by a cutting head having a plurality of staggered cutting blades, and the pressing die and the cutting head can cooperate to cut a cross-shaped mark on the blank.

[0020] Furthermore, the mixing, stirring and dispersing process is achieved through a mixing device, which includes a material dividing device, a stirring device and a dispersing device. The material dividing device is used to separate different raw materials and control the amount of raw materials fed into the stirring device, the stirring device is used to stir and mix several raw materials, and the dispersing device is used to disperse the stirred raw materials.

[0021] Furthermore, the material dividing device includes a material storage barrel, a first cylinder, a mounting seat, a plurality of plugging heads, and a material guide pipe. The material storage barrel is provided with a central tube, a bottom plate and a plurality of partitions. The plurality of partitions are evenly arranged around the central tube, and the plurality of partitions divide the space in the material storage barrel into accommodating spaces of different sizes. A discharge hole connected to the accommodating space is opened on the bottom plate. The first cylinder is embedded in the central tube, and the output end of the first cylinder is fixedly connected to the mounting seat. A plurality of plugging heads are fixed on the mounting seat, and the plugging heads correspond to the discharge holes. The first cylinder drives the plugging heads to clear / seal the discharge holes.

[0022] Furthermore, the stirring device includes a stirring barrel, a first motor, a stirring blade, and a brush head. The stirring barrel is in a horizontal cylindrical shape. The material guide pipe is connected and communicated with the top of the stirring barrel. The first motor is fixed on the stirring barrel. The stirring blade is placed in the stirring barrel and fixedly connected to the output end of the first motor. The stirring blade is S-shaped. The brush head is fixed to the end of the stirring blade, and the brush head has bristles, which contact the inner wall of the stirring barrel.

[0023] Furthermore, the dispersion device includes a feed introduction pipe, a dispersion pipe, a feed discharge pipe, and a first dispersion component. The feed introduction pipe, the dispersion pipe and the feed discharge pipe are connected and communicated in sequence. The feed introduction pipe is connected and communicated with the bottom of the mixing barrel. A mesh plate is provided at the bottom of the dispersion pipe. The first dispersion component includes a support seat, a vibration motor and a dispersion disk. The support seat is fixed on the mesh plate, the vibration motor is fixed on the support seat, the dispersion disk is fixedly connected to the output end of the vibration motor, and the dispersion disk is in the shape of an inverted bowl.

[0024] Furthermore, a bracket, a second cylinder, a sealing head and a feed plate are provided in the feed pipe. The bracket is fixed in the feed pipe, the second cylinder is fixed on the bracket, the output end of the second cylinder is fixedly connected to the sealing head, the sealing head can be extended into the mixing barrel, the sealing head is provided with scraping teeth that cooperate with the bristles, and a plurality of feed plates are arranged alternately from top to bottom.

[0025] Furthermore, the dispersion device also includes a second dispersion component, which includes a second motor fixed on the discharge pipe, an eccentric wheel fixed to the output end of the second motor, and a dispersion plate hinged to the discharge pipe. The eccentric wheel and the dispersion plate are both placed in the discharge pipe, and the eccentric wheel cooperates with the dispersion plate.

[0026] By adopting the above technical solution, the beneficial effects of the present invention are:

[0027] In the anticorrosive powder coating of the present invention, epoxy resin has good adhesion, chemical corrosion resistance and electrical insulation. Phenolic epoxy resin has excellent weather resistance, water resistance and chemical resistance, and can improve the anticorrosion performance of the coating. Trimethylhexamethylenediamine is used as a curing agent, which can react with epoxy resin to form a stable cross-linked structure, thereby improving the hardness, wear resistance and chemical corrosion resistance of the coating. Dimethylimidazole is a accelerator, which can accelerate the curing process of the curing agent and make the coating form a cross-linked structure faster. Graphene is a new type of nano material with excellent electrical conductivity, thermal conductivity and mechanical properties, and can enhance the corrosion resistance, wear resistance and permeability resistance of the coating. Ethylene bis stearamide, as a lubricant and dispersant, can improve the fluidity of the coating, prevent the sedimentation of pigments and fillers, and make the coating more uniform. The antioxidant DNP can effectively inhibit the oxidation reaction generated by the coating during the curing process, and prolong the shelf life and service life of the coating. The addition of glass flakes can enhance the permeability resistance and wear resistance of the coating. Shell powder is a natural inorganic filler that can increase the volume of the coating, reduce costs, and improve the hardness and weather resistance of the coating. Silicon oxide has good insulation and weather resistance, which can improve the stability and durability of the coating. Quartz powder has high hardness and wear resistance, which can enhance the physical properties of the coating. Red iron oxide is used to adjust the color of the coating and give the coating a beautiful appearance. Kaolin has good dispersibility and hiding power, which can improve the suspension and construction properties of the coating.

[0028] In summary, various raw materials play their own unique roles in the coating, and together they constitute the excellent performance of powder coatings. From the film-forming properties of epoxy resins and phenolic epoxy resins, to the curing effects of trimethylhexamethylenediamine and dimethylimidazole, to the special functions of additives such as graphene and ethylenebisstearamide, each component is an indispensable part of powder coatings.

[0029] At the same time, various inorganic fillers and pigments are added to powder coatings, such as glass flakes, shell powder, silicon oxide, quartz powder, red iron oxide and kaolin. They not only improve the physical properties of the coating, but also give the coating rich colors and beautiful appearance.

[0030] The preparation method of the present invention can provide more complete and uniform mixing of raw materials in the premixing stage, and can also prepare the coating of the present invention more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the process of the preparation method of the present invention.

[0032] Figure 2It is a schematic diagram of the structure of the pressing die and the cutting head.

[0033] Figure 3 Schematic diagram of the structure of the mixing device.

[0034] Figure 4 It is a schematic diagram of the cross-sectional structure of the material distribution device.

[0035] Figure 5 It is a schematic diagram of the top view of the material distribution device.

[0036] Figure 6 It is a schematic diagram of the cross-sectional structure of the stirring device.

[0037] Figure 7 It is a schematic diagram of the cross-sectional structure of the dispersion device. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] The marine anticorrosive powder coating is composed of the following raw materials in parts by weight: 50-70 parts of epoxy resin, 1-20 parts of phenolic epoxy resin, 5-12 parts of trimethylhexamethylenediamine, 0.2-0.4 parts of dimethylimidazole, 3-5 parts of graphene, 0.8-1.2 parts of ethylenebisstearamide, 1-3 parts of antioxidant DNP, 0.5-1 parts of glass flakes, 5-10 parts of shell powder, 3-5 parts of silicon oxide, 3-5 parts of quartz powder, 0.2-0.5 parts of red iron oxide, and 5-8 parts of kaolin; the glass flakes are flaky glass flakes with a mesh size of 2500-3000.

[0041] The method for preparing a marine anticorrosive powder coating comprises the following steps:

[0042] S1. Raw material preparation: including epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole, graphene, ethylenebisstearamide, antioxidant DNP, glass flakes, shell powder, silicon oxide, quartz powder, red iron oxide, and kaolin.

[0043] S2, premixing: epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole and ethylenebisstearamide are mixed, preheated at 90-120°C for 15-25 minutes, and the material is cooled and then fully ground to obtain component A; shell powder, silicon oxide, quartz powder and kaolin are mixed, and calcined at 240-300°C for 5-6 hours, and the material is cooled and then fully ground to obtain component B; glass flakes, graphene, red iron oxide and antioxidant DNP are mixed to obtain component C.

[0044] S3, preliminary treatment: Component A, component B and component C are mixed, stirred and dispersed, and then melted and extruded through an extruder to obtain a billet; after the billet is extruded by the extruder, the billet is first extruded into a sheet through an extrusion roller, and then the sheeted billet is divided into a plurality of sections, and then the plurality of sections of the billet are cooled and indentations are cut on the billet at the same time, and then the cooled billet is cut into a plurality of small pieces, and finally the plurality of small pieces of the billet are ground into a powdery semi-finished product by a grinding device;

[0045] The indentation is formed by a pressing die 1, which has a plurality of crisscross indentation plates 11, and the small pieces of the stock are formed by pressing down and cutting by a cutting head 2, which has a plurality of cutting blades 21 staggered at an angle of 45° (135°); the pressing die 1 presses a plurality of crisscross indentations on the segmented stock when the segmented stock is cooled but not completely hardened; thereafter, after the stock is cooled to be completely hardened, the cutting head 2 presses down and cuts it, and the blade marks on the cutting head 2 and the pressing die 1 are staggered, so that the pressing die 1 and the cutting head 2 can cooperate to cut a cross-shaped mark on the stock, that is, when the cutting head 2 cuts the stock into small pieces, the indentations are also easily broken under the extrusion of external force, thereby further increasing the crushing area of ​​the stock, and improving the crushing efficiency and crushing degree of the stock;

[0046] Among them, the mixing, stirring and dispersing process is realized by a mixing device, which includes a dividing device 3, a stirring device 4 and a dispersing device 5. Components A, B and C can be placed in the dividing device 3 respectively, while separating the three raw material components and controlling the amount of raw materials fed into the stirring device 4. The stirring device 4 is used to stir and mix several raw materials and feed the stirred raw material components into the dispersing device 5. The dispersing device 5 is used to fully disperse the stirred raw materials.

[0047] S4, screening treatment, the ultrafine powder and coarse powder in the semi-finished product are screened out to obtain the finished product.

[0048] The material distributing device 3 includes a material storage barrel 31, a first cylinder 32, a mounting seat 33, three plugging heads 34, and a material guide pipe 35. A central tube 311, a bottom plate 312 and three partitions 313 are provided in the material storage barrel 31. The partitions 313 are evenly arranged around the central tube 311, and the three partitions 313 divide the space in the material storage barrel 31 into three accommodating spaces 301 of different sizes. A discharge hole 302 communicating with the accommodating space 301 is opened on the bottom plate 312. The first cylinder 32 is embedded in the central tube 311, and the output end of the first cylinder 32 is fixedly connected to the mounting seat 33. The three plugging heads 34 are fixed on the mounting seat 33. The material heads are truncated cone-shaped and can be replaced with different sizes and models according to the amount of material discharged. The plugging heads 34 correspond to the discharge holes 302, and the first cylinder 32 drives the plugging heads 34 to clear / seal the discharge holes 302.

[0049] Before stirring the three components of raw materials, the three components of raw materials are respectively fed into the three containing spaces 301 of the storage barrel 31 according to the amount of materials; the three blocking heads 34 are driven up and down by the first cylinder 32 to extend into and out of the discharge hole 302, thereby controlling the discharge of materials; after the materials are discharged from the storage barrel 31, they are uniformly fed into the guide pipe 35, and the materials are discharged into the stirring device 4 through the guide pipe 35 for the stirring process; the dividing device 3 can control the amount of raw materials entering the stirring device 4, thereby achieving efficient and sufficient stirring of the raw materials.

[0050] The stirring device 4 includes a stirring barrel 41, a first motor 42, a stirring blade 43, and a brush head 44. The stirring barrel 41 is in a horizontal cylindrical shape. The material guide tube 35 is connected and communicated with the top of the stirring barrel 41. The first motor 42 is fixed on the stirring barrel 41. The stirring blade 43 is placed in the stirring barrel 41 and is fixedly connected to the output end of the first motor 42. The stirring blade 43 is S-shaped. The brush head 44 is fixed to the end of the stirring blade 43, and the brush head 44 has bristles, which contact the inner wall of the stirring barrel 41.

[0051] After the three components of raw materials fall into the mixing barrel 41, the first motor 42 starts and drives the stirring blade 43 to rotate. The stirring blade 43 is generally a single piece. The stirring blade 43 pushes the raw materials in the mixing barrel 41 to disturb up and down, thereby achieving sufficient stirring and mixing of the raw materials; the S-shaped stirring blade 43 can increase the contact area with the raw materials, and at the same time, it can also make the mixing more sufficient when the raw materials are pushed to move to a high place and fall freely, thereby greatly enhancing the stirring efficiency of the raw materials; when the stirring blade 43 rotates, the bristles collide with the inner wall of the mixing barrel 41, thereby pushing the raw materials at the bottom of the mixing barrel 41 to the top of the mixing barrel 41, thereby achieving comprehensive stirring of the raw materials.

[0052] The dispersion device 5 includes a feed pipe 51, a dispersion pipe 52, a feed pipe 53, a first dispersion component 54 and a second dispersion component 55. The feed pipe 51, the dispersion pipe 52 and the feed pipe 53 are connected and communicated in sequence from top to bottom. The feed pipe 51 is connected and communicated with the bottom of the mixing barrel 41. A mesh plate 56 is provided at the bottom of the dispersion pipe 52. The first dispersion component 54 includes a support seat 541, a vibration motor 542 and a dispersion plate 543. The support seat 541 is fixed on the mesh plate 56. The vibration motor 542 is fixed on the support seat 541. The dispersion plate 543 is fixedly connected to the output end of the vibration motor 542. The dispersion plate 543 is in an inverted bowl shape. The feed pipe 51 is provided with a bracket 511, a second cylinder 512, a sealing head 513 and a feed plate 514. The bracket 511 is fixed in the feed pipe 51, the second cylinder 512 is fixed on the bracket 511, the output end of the second cylinder 512 is fixedly connected to the sealing head 513, the sealing head 513 can extend into the mixing barrel 41, and the sealing head 513 is provided with scraping teeth 515 that cooperate with the bristles. A plurality of feed guide plates 514 are arranged alternately from top to bottom and the feed guide plates 514 are inclined, and the feed guide plates 514 may be provided with convex patterns or protrusions; the second dispersion component 55 includes a second motor 551 fixed on the feed tube 53, an eccentric wheel 552 fixed to the output end of the second motor 551, and a dispersion plate 553 hinged to the feed tube 53, the eccentric wheel 552 and the dispersion plate 553 are both placed in the feed tube 53, and the eccentric wheel 552 cooperates with the dispersion plate 553.

[0053] When the stirring device 4 is in the stirring process, the sealing head 513 is placed in the stirring barrel 41. As the stirring blade 43 rotates, the bristles also pass through the sealing head 513, and the bristles collide with the scraping teeth 515 on the sealing head 513. The scraping teeth 515 can clean the raw materials attached to the bristles, ensuring that the bristles effectively scrape the inner wall of the stirring barrel 41. After the stirring device 4 completes the stirring of the raw materials, the second cylinder 512 drives the sealing head 513 to move downward until it is out of the stirring barrel 41, thereby opening the discharge port at the bottom of the stirring barrel 41, and the raw materials in the stirring barrel 41 fall into the feed pipe 51.

[0054] When the raw material passes through the feed pipe 51 and hits the feed plate 514, the staggered feed plates 514 disperse and disturb the falling raw material. When the raw material hits the irregularly arranged convex patterns or protrusions, the raw material can also be dispersed. After that, the raw material enters the distribution pipe from the feed pipe 51.

[0055] When the raw material falls into the material distribution pipe, it first falls onto the dispersion plate 543. At this time, the vibration motor 542 drives the dispersion plate 543 to vibrate, thereby vibrating and dispersing the raw material falling thereon; then, the raw material falls from the surrounding of the dispersion plate 543 and falls into the feed pipe 53 after passing through the mesh plate 56; the mesh plate 56 can also play a role in equalizing and dispersing the raw material powder passing therethrough;

[0056] When the raw material falls from top to bottom in the discharge pipe 53, the second motor 551 drives the eccentric wheel 552 to rotate, and the eccentric wheel 552 pushes the dispersion plate 553 to swing back and forth, thereby beating and dispersing the falling powder, further improving the dispersion effect of the raw material.

[0057] In summary, the mixing and dispersion effect of the raw material components can be greatly improved through mixing equipment, so that the raw material components can be mixed more comprehensively and evenly, thereby improving the coating effect of the powder coating.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a marine anticorrosive powder coating, characterized in that: Includes steps: Raw material preparation, including epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole, graphene, ethylenebisstearamide, antioxidant DNP, glass flakes, shell powder, silicon oxide, quartz powder, red iron oxide, and kaolin; Premixing: epoxy resin, phenolic epoxy resin, trimethylhexamethylenediamine, dimethylimidazole and ethylenebisstearamide are mixed, and then preheated at 90-120°C for 15-25 minutes, and the material is cooled and fully ground to obtain component A; shell powder, silicon oxide, quartz powder and kaolin are mixed, and calcined at 240-300°C for 5-6 hours, and the material is cooled and fully ground to obtain component B; glass flakes, graphene, red iron oxide and antioxidant DNP are mixed to obtain component C; Preliminary treatment: Component A, component B and component C are mixed, stirred and dispersed, and then melted and extruded through an extruder to obtain a blank; then, the blank is sheeted, cooled, cut and ground to obtain a semi-finished product; Screening treatment to remove ultrafine powder and coarse powder from the semi-finished product to obtain the finished product; The mixing, stirring and dispersing process is realized by a mixing device, which includes a material dividing device, a stirring device and a dispersing device. The material dividing device is used to separate different raw materials and control the amount of raw materials fed into the stirring device. The stirring device is used to stir and mix several raw materials. The dispersing device is used to disperse the stirred raw materials. The material distribution device includes a material storage barrel, a first cylinder, a mounting seat, a plurality of plugging heads, and a material guide pipe. The material storage barrel is provided with a central tube, a bottom plate, and a plurality of partitions. The plurality of partitions are evenly arranged around the central tube, and the plurality of partitions divide the space in the material storage barrel into accommodating spaces of different sizes. A discharge hole connected to the accommodating space is opened on the bottom plate. The first cylinder is embedded in the central tube, and the output end of the first cylinder is fixedly connected to the mounting seat. A plurality of plugging heads are fixed on the mounting seat. The plugging heads correspond to the discharge holes. The first cylinder drives the plugging heads to clear / seal the discharge holes. The stirring device comprises a stirring barrel, a first motor, a stirring blade, and a brush head. The stirring barrel is in a horizontal cylindrical shape. The material guide pipe is connected and communicated with the top of the stirring barrel. The first motor is fixed on the stirring barrel. The stirring blade is placed in the stirring barrel and is fixedly connected to the output end of the first motor. The stirring blade is in an S shape. The brush head is fixed on the end of the stirring blade, and the brush head has bristles, which contact the inner wall of the stirring barrel. The dispersing device includes a feed introduction pipe, a dispersing pipe, a feed discharge pipe, and a first dispersing component. The feed introduction pipe, the dispersing pipe, and the feed discharge pipe are connected and communicated in sequence. The feed introduction pipe is connected and communicated with the bottom of the mixing barrel. A mesh plate is provided at the bottom of the dispersing pipe. The first dispersing component includes a support seat, a vibration motor, and a dispersing disk. The support seat is fixed on the mesh plate, the vibration motor is fixed on the support seat, the dispersing disk is fixedly connected to the output end of the vibration motor, and the dispersing disk is in the shape of an inverted bowl.

2. The method for preparing a marine anticorrosive powder coating according to claim 1, characterized in that: The raw materials are divided by weight as follows: 50-70 parts of epoxy resin, 1-20 parts of phenolic epoxy resin, 5-12 parts of trimethylhexamethylenediamine, 0.2-0.4 parts of dimethylimidazole, 3-5 parts of graphene, 0.8-1.2 parts of ethylenebisstearamide, 1-3 parts of antioxidant DNP, 0.5-1 parts of glass flakes, 5-10 parts of shell powder, 3-5 parts of silicon oxide, 3-5 parts of quartz powder, 0.2-0.5 parts of red iron oxide, and 5-8 parts of kaolin.

3. The method for preparing a marine anticorrosive powder coating according to claim 2, characterized in that: The glass flakes are flaky glass flakes with a mesh size of 2500-3000.

4. A method for preparing a marine anticorrosive powder coating according to claim 1 or 3, characterized in that: After the blank is extruded by the extruder, the blank is first squeezed into a sheet by an extrusion roller, and then the sheet is divided into a plurality of sections. After that, the plurality of sections of the blank are cooled and indentations are cut on the blank at the same time. Then, the cooled blank is cut into a plurality of small pieces, and finally, the plurality of small pieces of the blank are ground into a powdery semi-finished product by a grinding device.

5. The method for preparing a marine anticorrosive powder coating according to claim 4, characterized in that: The indentation is formed by a pressing die, which has a plurality of crisscrossing indentation plates. The small piece of blank is formed by a cutting head, which has a plurality of staggered cutting blades. The pressing die and the cutting head can cooperate to cut a cross-shaped mark on the blank.

6. The method for preparing a marine anticorrosive powder coating according to claim 5, characterized in that: The feed pipe is provided with a bracket, a second cylinder, a sealing head and a feed plate. The bracket is fixed in the feed pipe, the second cylinder is fixed on the bracket, the output end of the second cylinder is fixedly connected to the sealing head, the sealing head can be extended into the mixing barrel, the sealing head is provided with scraping teeth matching with the bristles, and a plurality of feed plates are arranged alternately from top to bottom. The dispersing device also includes a second dispersing assembly, which includes a second motor fixed on the discharge pipe, an eccentric wheel fixed to the output end of the second motor, and a dispersing plate hinged to the discharge pipe. The eccentric wheel and the dispersing plate are both placed in the discharge pipe, and the eccentric wheel cooperates with the dispersing plate.

Images